31314440220 has 144 divisors (see below), whose sum is σ = 101118151680. Its totient is φ = 7093029888.

The previous prime is 31314440141. The next prime is 31314440221. The reversal of 31314440220 is 2204441313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31314440221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5360061 + ... + 5365899.

Almost surely, 2^31314440220 is an apocalyptic number.

31314440220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31314440220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50559075840).

31314440220 is an abundant number, since it is smaller than the sum of its proper divisors (69803711460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31314440220 is a wasteful number, since it uses less digits than its factorization.

31314440220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084 (or 5969 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31314440220 its reverse (2204441313), we get a palindrome (33518881533).

The spelling of 31314440220 in words is "thirty-one billion, three hundred fourteen million, four hundred forty thousand, two hundred twenty".